Method and apparatus for making centrifugal castings



April 7, 1925.

P. .J. FLAHERTY METHOD AND APPARATUS FOR MAKING CENTRIFUGAL CA STINGS Filed Nov. 1922 2 Sheets-Sheet l JIiNVENTORZ s M April 7, 1925. 1,532,690

P. J. FLAHERTY KING CENTRIFUGAL CASTINGS 2 Sheeizs-Sheet 2 METHOD AND APPARATUS FOR MA Filed Nov. 22, 1922 Patented Apr. 7, 1925.

UNITED STATES.

PATENT OFFICE.

'PATRICK J. FLAnEuT'Y, or N'Ew-cAsTLE, PENNSYLVANIA, ASSIGNOR TO THE JOHN- soN BRONZE COMPANY, or NEW CASTLE, PENNSYLVANIA, A coaronA'rroN or PENNSYLVANIA.

METHOD AND APPARATUS FOR MAKING CENTRIFUGAL CASTING-S.

Application filed November 22, 1922. Serial-No. 602,527.

State of Pennsylvania, have invented a new and useful Improvement in Methods and Apparatus for Making Centrifugal Castings, of which the following is a full, clear,

and exact description.

This invention relates to method and apparatus for making centrifugal castings, and is particularly adapted for making lined bearings. In the manufacture of such bearings, a shell of bronze or other suitable material is cleaned and given a preliminary Wash of tin to insure adhesion, and then lined with bearing metal, such as babbitt, by the centrifugal casting process.

In the manufacture of lined bearings, it is important to have the shell properly centered andalined in order to get a uniform thickness of bearing metal inside. Where a large number of sizes are to be made this becomes expensive on account of the large number of machines necessary to accommodate shells of various sizes. I provide two heads for supporting the mold or shell, and a series of removable adapters'for the heads, by which it is possible to accommodate different sized molds 0r shells on the same machine by using suitable adapters. I also provide for directing a cooling last of air through the shell in order to more quickly freeze the lining metal.

In theaccompanying drawings illustrating the preferred embodiment of my invention,

Figure 1 is a side elevation of my -inven- I perspective view of an adapter.

In the illustrated embodiment of my invention, there is provided a live head or spindle 2 and a dead head or spindle 3 which may be carried bythe head and tail stocks, respectively, of an ordinary lathe. These heads may take various forms, and while they are shown as spindles, are not limited thereto. The live head 2 is bored out to receive an adapter 4,- which is held in place by a set screw 5 engaging a slot 6.

The other head is provided with an adapter 7, behind which is a ball bearing 8. The adapter 7 is free to rotate-on the dead head 3. A cup 9 and a passage 10 in the dead head are provided for the introduction of the molten metal to be cast, while cooling airis supplied from a blower 11 through a passage 12.

In operation, the heads are separated by backing off the tail-stock of the lathe, and a tinned shell 14; is placed between the adapters. The tail-stock-is then moved up and clamped. The Working faces of the adapters are provided with tapering circular recesses 13 which receive the ends of the shell 14, thus insuring proper centering.

The lathe is started up and a measured quantity of molten metal is poured into the cup 9, from which it passes to the interior of the spinning mold by the passage 10. This passage is at an angle to the axis of the mold, and therefore serves to directthe metal toward the interior surface of the shell 14.

Cooling air enters through the passage 12, which alsoterminates at an angle, and

another. I also provide simple and dependable means for air cooling the centrifugal casting, by directing the .cooling air against the surface to be cooled.

While I have shown the preferred embodiment of my invention, it will be'und'erstood that it is not limited to the illustrated form, but may be' embodied in other conend thereof, the dead head having an opening for the molten material to be cast and a second opening for the introduction of a cooling medium, substantially as described.

2. In apparatus for centrifugal casting,

a mold, a live head adapted to rotate the mold, a removable adapter for the live head rotatable therewith, a dead head, and a removable rotatable adapter thereupon, said adapters being adapted to accommodate the ends of the mold for centering and supporting the same, substantially, as described.

3. In apparatus for centrifugal casting, a mold, a live head adapted to rotate. the mold, a removable adapter for the live head rotatable therewith, a dead head, a removable rotatable adapter thereupon, and means for introducing the molten material to be east through the dead head, substantially as described.

4. In apparatus for centrifugal casting, a mold, a head for supporting the mold,

80 means for introducing a cooling medium to the interior of the mold, the head having an cooling medium from the mold to the opening in the head, substantially as described.

5. In apparatusfor centrifugal casting, a mold, relatively rotatable heads for supporting the mold, a removable 'adapter for each. head, said adapters being adapted to accommodate the ends of the mold for centering and supporting the same, and means whereby the molten material to be cast may be introduced through one of said heads. substantially as described.

6. In apparatus for centrifugal casting, a mold,'a live head adapted to'rotate the mold. a removable adapter for the live head rotatable therewith, a dead head, and a removable adapter for the dead head rotatable thereupon. said dead head having separate passages therethrough for the introduction of the molten material and a cooling medium to the mold and the live head and its adapter having openings therethrough for the egress of the cooling medium, substantially as described.

In testimony whereof I have hereunto set my hand.

' PATRICK J. FLAHERTY. 

